The Boost Controller

Dec 16, 2003 | By: Matyas Varga - SRO

G-Reddy E-01 Electronic Boost Controller


It is important to note that stock systems with a wastegate
actuator operated by means of boost pressure do not come equipped with
a boost controller. When you have a boost pressure operated actuator,
the actuator itself is the mechanism limiting your boost. In essence,
the actuator opens your wastegate when boost levels reach the
predetermined PSI level. Now in order to get more boost from your turbo
system in this sort of set-up, you need to install a boost controller
(bottom pic). A boost controller limits the amount of pressure that
gets sent to the wastegate actuator. In a sense, it fools it to think
that less boost is being created in the system. In turn, it will open
the wastegate at higher levels of boost. On the other hand, we have a
wastegate actuator operated by means of a solenoid. In this sort of
set-up, the system is tied into your engine management system. Boost
pressure is detected by an air flow sensor, this signal is then sent to
your ECU and your ECU will regulate boost pressure accordingly. In such
a set-up, you do no install a mechanical boost controller. In the
latter case, people typically reprogram their engine management system
to allow for more boost. A more intricate set-up will employ a boost
controller which is electronically tied into your ECU. An example of
this sort of set-up is the G-Reddy E-01 (top pic). This unit sells for
about $500 and offers the option to adjust your turbo system to suit
driving conditions. As for those of you with a conventional system,
electronic boost control conversions are available

Conventional Boost Conroller


As appealing as an electronic interface may be, one should note that an
ECU upgrade will typically conflict with a unit like the G-Reddy. You
will have to chose which one you preffer. Mind you most ECU upgrades
will come with preconfigured selecatable boost levels. In addition,
they will also control all other vital engine parts such as fuel and
ignition. However, the problem with boost controllers is that your
engine was designed for only so much boost pressure. Altering factory
settings will yield a shorter engine life. Furthermore, it will more
then likely void your waranty. However, some engines have been tuned
down. A prime example would be Volkswagens 1.8 turbo. This 20 valve
engine was originally designed for Audi. The only difference is a
smaller turbocharger and a different intake system. For this reason, an
engine like the volkswagen 1.8T would be an ideal choice to increase
boost. None the less, it is still important to realize that overall
durability will be compromised